rockefeller



July 26, 1927.

J. WQROCKEFELLER. JR

SPRING SCALE Filed April 29. 1926 2 sheets-sheet 1 [N V EN TOR.

A TTORNEYS.

' Y Y 4 1 July- 26,1927, J. w ROCKEFELLER' JR 636 708 SPRING SCALE Fild April 29. 1926 2 Sheets-Sheet 2 IN VENTOI? A TTOR/VEY Patented July 26, 1927. g i i 1 i ITEDf'STATES/fPATENTF oer-" ce.

JOHN w. Roc tEr ELLrm, .73., OF NEW YORK, 1\T{Y., Ass IeNorv'ro JoH N cHArr'I LoN & I sNs,.or 1-iwYoRK, N. Y., A- CQRBORATIQN or ew roan. w

SPRING SCALE.

Application filed April 29, 1926. serial No. 105,384.

This invention relates. to scales, particir. ,ment being provided with the pivots 26 and 55 larly those provided with automatic means 27 to lessen transverse movement of .the to compensate for changes in the resiliency. springs with elongation, asshown in Figs. of the spring with,;temperature variation, 4 and 5, the rivets 28 connect the load sup 5 and has for its object to provide asimple. port :11 withtherack and its pivot 12. and'inexpensive meansfor automatically in- 6 shows a scale'similar to that'j'in Fig. 1' .60 creasing the accuracy of spring scales under except that an additional thermally con-l changes in temperature. 1 f trolledbeam, 30 is employed at the topot the According to this invention, a scaleis pro springs instead offhaving ,the1 springs atvided comprising a compoundspring system tached directly to the casing. The spring having a coil springand two leaf springs beam 30 correspondsto the beam 19 o f Fig. 1

which together are in series with the coil land is attached tothe framej or casing at spring, one of the leaf springs. being sub- 31 by meansof the bolt;32. {Securing means. stantially unaffected by temperature,- and the 33 and 3 1 are us'edforthe' springs the same other a bi-metallic leaf spring to contact as thesec uring means 24'and 25 at their with more of the length ,oftheother leaf lower ends. Thebi-metallic thermal ele- 9 spring upon increase intemperature and .to merit 35 islike the element except that the contact less with said other leaf spring upon element 35 is reversed,,i.e. the invaris ar- 1 .decrease in temperature, toneutralize: tem v ranged on the top. Such a construction 29 perature variations in resiliency the coil .givesincreased compensation and is 'ofuse springs. I ,where long springsfare e'mployed '1 f Referring to the drawings: I Among the-advantages, of this invention Fig. 1 illustrates one. embodiment of this may be mentioned its simplicityand cheap-1 invention. I a r f ness, alsoitsfreedomirom any complicated Fig. 2 is a section on the line;2+2 of .system of -leve'rs.and the like. In practice Fig. 1. H h the fthermostaticelement 20 is incontact 8 Fig. 3 is a section on'the line- 3*5-3? of withvarying lengths, of the beam 19'Qun'der' Fi 1 I Y changesi i-temperature. Theelement 20, Fig. 4-. is adetail corresponding to Fig. being slightly resilient-, has theeffect of 1 in colder weather. .rvarying the resiliency of thespringbeam 19";

Fig? 5 is a detail corresponding. to Fig. by changing its effective length, orconsidei 85 4 under load. a ingspring beam 19 and thermostatic element Fig. (ishows another embodiment. of this together as a compound. spring, its eflective invention employing two thermal elements, thickness ischanged, and'it therefore varies V one at the top andione at the bottom of the its resiliency with temperature. Under nosprings. x ,load conditions with low temperatures the 90 Through the usual casing 10 extends v a element 20 contacts with ;only a relatively runner or load support 11 which actuates short length of the spring beam 19, while the rack 13 pivoted at 12to. the load sup- .with higher. temperatures the thermostatic port orrunner 11. ;Engaging;rack 13 is element'contacts throughouta greater length the pinion 14 on the sh aft 15 of the indicator of said spring beam. the coil spring 95 16. Coil springs 17 and 18 aresecured at has been illustrated as] attached directly to their upper ends to: the casing and at their. the casing, it willbe understood that the coil lower ends to the flat spring beam 19. Se spring might be attached to "the casing cured by clamp screws 21to the fiat spring through the two; leaf springs illustrated or beam-19 is the bi-metallic thermostatic elein scales having very long coil springs these 109 ment 20, preferably composed of. zinc and two leaf springs maybe-used at each end invar-or of brass and invar, with the brass. of the coil'spring. as in Fig.6. With theror zinc arran ed on top. Spring 23 engages .mal compensation at the top and bottom of the lower end'ofthe rack 13 and keeps the the. springs, a greatendeg'ree of compensasame in engagement with the pinionl. tion -for resiliency is, pr'esent andthecon- "1P Nuts 24: and 25 adjustably control theat-istruction; illustrated possesses the added ad- 7 tachment of the beam 19 to the lower ends vantage of enabling'the springs to be subof the 1 Sp gs;1 3M118; Thisattach stantially parallel atgall times and i any error due to change in the moment arm. The beams 19 and 30 are more resilient than their respective thermal elements.

I claim:

1. A scale comprising a coil spring, a casing to which said spring is attached, a runner to which said s ring is attached at the opposite end, an in icator responsive to the elongation of the spring under load, a flat spring connected at a free end to said coil spring, temperature responsive means for automatically varying the resiliency of said fiat spring by varying its effective thickness.

2; A scale comprising a compound spring system having a coil spring and two leaf springs which together are in series with the coil spring, one of the leaf springs being substantially unaffected by temperature, and the other a bi-metallic leaf spring arranged to contact'with more of the length of said first leaf spring upon increase in temperature and less upon decrease in temperature to neutralize temperature variations in resiliency in said coil spring.

3. A scale comprising a coil spring, a casing to which said coil spring is attached, a runner to, which said spring is attached at the opposite end, an indicator responsive to elongation of said spring under load, a compound flat spring connected at a free end of said coil spring and including a temperature responsive means for automatically varying the resiliency of said compound spring by varying its effective thickness.

4. A scale comprising a coil spring, a casing to which said spring is attached, a runner to which said spring is attached at its opposite end, an indicator responsive to elongation of the spring under load, a flat spring connected at a free end to said coil spring, a yieldable fulcrum for said fiat spring, and temperature responsive means for automatically varying the position of said fulcrum and varying the resiliency of said flat spring inversely to change in resiliency of said coil spring.

5. A scale comprising a coil spring..acasing to which the spring is attached, a runner I to which the spring is attached at the opposite end. an indicator responsive to elongation of said spring under load, a flat spring connected at a free end to said coil spring, a rolling fulcrum for said flat spring, and means for rolling said fulcrum along said flat spring to have greater or less longitudinal contact with said flat spring in response to variations in temperature.

6. A scale comprising a coil spring, a casing to which said spring is attached, a runner to which the spring is attached at the opposite end, an indicator responsive to elongation of said spring under load, a flat spring connected at a free end to said coil spring, and a thermostatic element secured longitudinally of said flat spring for engagement with varying lengths of said flat spring.

7. A scale comprising a pair of coil springs, a casing to which said springs are attached, a flat spring beam to which said springs are attached at their opposite ends, an indicator actuated by said beam, and temperature responsive means for automatically varying the resiliency of said beam.

8. A scale comprising a pair of coil springs, a casing to which said springs are attached, a fiat spring beam to which said springs are attached at their opposite ends, an indicator actuated by said beam, and a bi-metallic thermostatic element clamped adjacent the central portion of said beam to automatically vary the resiliency of said beam in response to temperature.

9. A scale comprising a pair of coil springs, a casing to which said springs are attached, a flat spring beam to which said springs are attached at their opposite ends, an indicator actuated by said beam, and a be-metallic thermostatic elementof less resiliency than said beam clamped thereto adjacent the central portion and arranged to vary the resiliency of said beam in response to temperature inversely as the resiliency of said coil springs is changed.

10. The combination with a support, of a compound flat spring secured to said support and comprising a bi-metallic thermal element secured longitudinally to and forming a part of said spring adjacent said support and arranged to correct for changes in resiliency of said spring with temperature.

11. A scale comprising a coil spring, a casing to which said spring is attached, a runner to which said spring is attached at the opposite end, an indicator responsive to elongation of the spring under load, a flat spring connected at a free end to each end of said coil spring, and temperature responsive means for automatically varying the resiliency of said flat spring.

12. A scale comprising a coil spring, a casing to which said coil spring is attached, a runner to which the spring is attached at the opposite end, an indicator responsive to elongation of the spring under load, a Hat spring connected at a free end to each end of said coil spring, and a thermostatic ele- ,ment secured longitudinally of each flat spring for engagement with varying lengths of each fiat spring. a

13. A laminated flat spring comprising a bi-metallic thermostatic spring element and a longer and more resilient flat spring secured longitudinally to said element and projecting beyond an end thereof.

Signed at New York city, in the county of New York and State of New York, this 20th day of April, A. D. 1926.

JOHN w; ROCKEFELLER, JR. 

